/Engine/Source/Runtime/MovieSceneCapture/Public/Protocols/UserDefinedCaptureProtocol.h
Called when pixels have been received for the specified stream name
void OnPixelsReceived ( const [FCapturedPixels](API\Runtime\MovieSceneCapture\Protocols\FCapturedPixels) & Pixels, const [FCapturedPixelsID](API\Runtime\MovieSceneCapture\Protocols\FCapturedPixelsID) & ID, [FFrameMetrics](API\Runtime\MovieSceneCapture\FFrameMetrics) FrameMetrics )